<template>
  <view class="content">
    <view class="navbar" :style="{position:headerPosition,top:headerTop}">
      <view class="nav-item" :class="{current: filterIndex === 0}" @click="tabClick(0)">综合排序</view>
      <view class="nav-item" :class="{current: filterIndex === 1}" @click="tabClick(1)">销量优先</view>
      <view class="nav-item" :class="{current: filterIndex === 2}" @click="tabClick(2)">
        <text>价格</text>
        <view class="p-box">
          <text :class="{active: priceOrder === -1 && filterIndex === 2}" class="yticon icon-shang"></text>
          <text :class="{active: priceOrder === 1 && filterIndex === 2}" class="yticon icon-shang xia"></text>
        </view>
      </view>
    </view>
    <view class="goods-list">
      <view v-for="(item, index) in goodsList" :key="index" class="goods-item" @click="navToDetailPage(item)">
        <view class="image-wrapper">
          <image :src="item.designSketch[0]" mode="aspectFill" />
        </view>
        <text class="title clamp">{{item.skuName}}</text>
        <view class="price-box">
          <text class="price">{{item.price}}</text>
          <text>已售 {{item.salesVolume}}</text>
        </view>
      </view>
      <u-empty v-if="goodsList.length==0" text="当前分类下暂无商品~~" mode="list"></u-empty>
    </view>
  </view>
</template>

<script>
import { getClassTypeList } from "@/api/category.js";
export default {
  data() {
    return {
      headerPosition: "fixed",
      headerTop: "0px",
      filterIndex: 0,
      priceOrder: 0, //0 价格从低到高 1价格从高到低
      goodsList: [],
      queryInfo: {
        categoryId: null,
        price: 0, //价格
        salesVolume: 0 //销量
      }
    };
  },

  onLoad(options) {
    // #ifdef H5
    this.headerTop =
      document.getElementsByTagName("uni-page-head")[0].offsetHeight + "px";
    // #endif

    this.queryInfo.categoryId = options.categoryId;
    this.getClassType();
  },
  onPageScroll(e) {
    //兼容iOS端下拉时顶部漂移
    if (e.scrollTop >= 0) {
      this.headerPosition = "fixed";
    } else {
      this.headerPosition = "absolute";
    }
  },
  //下拉刷新
  onPullDownRefresh() {},
  //加载更多
  onReachBottom() {},
  methods: {
    getClassType() {
      uni.showLoading({
        title: "正在加载"
      });
      getClassTypeList(this.queryInfo).then(res => {
        uni.hideLoading();
        if (res.code != 1) {
          return;
        }
        this.goodsList = res.data;
      });
    },

    //筛选点击
    tabClick(index) {
      if (this.filterIndex === index && index !== 2) {
        return;
      }
      this.filterIndex = index;
      if (index === 2) {
        this.priceOrder = this.priceOrder === -1 ? 1 : -1;
      } else {
        this.priceOrder = 1;
      }

      uni.pageScrollTo({
        duration: 300,
        scrollTop: 0
      });
      //综合
      if (index == 0) {
        Object.assign(this.queryInfo, {
          price: 0, //价格
          salesVolume: 0 //销量
        });
      }
      //销量
      if (index == 1) {
        Object.assign(this.queryInfo, {
          price: 0, //价格
          salesVolume: 1 //销量
        });
      }
      //价格
      if (index == 2) {
        Object.assign(this.queryInfo, {
          price: this.priceOrder, //价格
          salesVolume: 1 //销量
        });
      }
      this.getClassType();
    },

    //详情
    navToDetailPage(item) {
      //测试数据没有写id，用title代替
      uni.navigateTo({
        url: `/pages/goodsDetail/goodsDetail?id=${item._id}`
      });
    },
    stopPrevent() {}
  }
};
</script>

<style lang="scss">
page,
.content {
  background: $page-color-base;
}

.content {
  padding-top: 96upx;
}

.navbar {
  position: fixed;
  left: 0;
  top: var(--window-top);
  display: flex;
  width: 100%;
  height: 80upx;
  background: #fff;
  box-shadow: 0 2upx 10upx rgba(0, 0, 0, 0.06);
  z-index: 10;

  .nav-item {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    font-size: 30upx;
    color: $font-color-dark;
    position: relative;

    &.current {
      color: $base-color;

      &:after {
        content: "";
        position: absolute;
        left: 50%;
        bottom: 0;
        transform: translateX(-50%);
        width: 120upx;
        height: 0;
        border-bottom: 4upx solid $base-color;
      }
    }
  }

  .p-box {
    display: flex;
    flex-direction: column;

    .yticon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 30upx;
      height: 14upx;
      line-height: 1;
      margin-left: 4upx;
      font-size: 26upx;
      color: #888;

      &.active {
        color: $base-color;
      }
    }

    .xia {
      transform: scaleY(-1);
    }
  }

  .cate-item {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    width: 80upx;
    position: relative;
    font-size: 44upx;

    &:after {
      content: "";
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      border-left: 1px solid #ddd;
      width: 0;
      height: 36upx;
    }
  }
}

/* 分类 */
.cate-mask {
  position: fixed;
  left: 0;
  top: var(--window-top);
  bottom: 0;
  width: 100%;
  background: rgba(0, 0, 0, 0);
  z-index: 95;
  transition: 0.3s;

  .cate-content {
    width: 630upx;
    height: 100%;
    background: #fff;
    float: right;
    transform: translateX(100%);
    transition: 0.3s;
  }

  &.none {
    display: none;
  }

  &.show {
    background: rgba(0, 0, 0, 0.4);

    .cate-content {
      transform: translateX(0);
    }
  }
}

.cate-list {
  display: flex;
  flex-direction: column;
  height: 100%;

  .cate-item {
    display: flex;
    align-items: center;
    height: 90upx;
    padding-left: 30upx;
    font-size: 28upx;
    color: #555;
    position: relative;
  }

  .two {
    height: 64upx;
    color: #303133;
    font-size: 30upx;
    background: #f8f8f8;
  }

  .active {
    color: $base-color;
  }
}

/* 商品列表 */
.goods-list {
  display: flex;
  flex-wrap: wrap;
  padding: 0 30upx;
  background: #fff;
  justify-content: flex-start;

  .goods-item {
    display: flex;
    flex-direction: column;
    width: 48%;
    padding-bottom: 40upx;

    &:nth-child(2n + 1) {
      margin-right: 4%;
    }
  }

  .not-goods {
  }

  .image-wrapper {
    width: 100%;
    height: 330upx;
    border-radius: 3px;
    overflow: hidden;

    image {
      width: 100%;
      height: 100%;
      opacity: 1;
    }
  }

  .title {
    font-size: $font-lg;
    color: $font-color-dark;
    line-height: 80upx;
  }

  .price-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-right: 10upx;
    font-size: 24upx;
    color: $font-color-light;
  }

  .price {
    font-size: $font-lg;
    color: $uni-color-primary;
    line-height: 1;

    &:before {
      content: "￥";
      font-size: 26upx;
    }
  }
}
</style>
